Multi-line text strings in the message file
Text strings in the source and target elements are normally word wrapped when displayed in error dialog boxes, so line breaks in the .xlf file are not significant. To force a line break in the displayed message use the x tag with a ctype attribute as follows:
<trans-unit id="123456" restype="message">
<source>First line<x ctype="lb">Second line</source>
<target>First line<x ctype="lb">Second line</target>
</trans-unit>